Malicious PDF — malware analysis report

Static analysis result for SHA-256 b233190d2cb4a35f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 18:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a23d62cffbe0f4ce01609411aed3a83 SHA-1: 8d4b44eb5acde3faa7493dafa8ad90c079402737 SHA-256: b233190d2cb4a35f092dbe944846586b098e6a07e70c7c948bcafcbca8cf2d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support this, suggesting the document is designed to host a large number of links for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=soul+calibur+ppsspp+iso PDF link annotation
    • http://srividyaastrology.com/userfiles/file/sidupa.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/vawetedepavunusim.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/82990711843.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/94396707430.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/fuxof.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lefosagixalinepexudu.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tevijasumemaralevejogew.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/zumefota.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/japarejekam.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327c000bb57---46049742954.pdfIn PDF document text
    • http://ore-processing.ru/d/files/68308183746.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ao8al0ekeu1da2fbr4j02pjo07/88712888890.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/gefemapomig.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/20219018318.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/35722889157.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/2162415310.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/tavufudogivofipizawepesax.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210913_54523C4999A320C6.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/ginoxisofu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914130930.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fj6ol41hiugf0s3f2j53pab253/70153632489.pdfIn PDF document text
    • http://jucal.es/images/file/93830522901.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/zemazonoxafusuwodamun.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/41139292369.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b8d09d20732a8502d83015340a27d50d/zulatepepif.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rujav.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb863e1e4---85672120676.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 19632 bytes
SHA-256: d13e6980e8048ae407449b15d91eb9e8cbcbfa6ba8699eba26e7f4dbc1ad9a6f
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 10348 bytes
SHA-256: c0fe0e834217d552e80ba3938decc8a381dde4921fbba3197c5a46ff6ddd6748

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